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. 1994 Feb 1;91(3):1064–1068. doi: 10.1073/pnas.91.3.1064

Distinct isoforms of neuregulin are expressed in mesenchymal and neuronal cells during mouse development.

D Meyer 1, C Birchmeier 1
PMCID: PMC521454  PMID: 8302832

Abstract

Neuregulin, the putative ligand of the c-neu receptor tyrosine kinase, can induce differentiation or growth of epithelia and other cells. To gain insight into the biological role of this factor, we have analyzed the expression of neuregulin during mouse embryogenesis and in the perinatal animal by a combination of in situ hybridization and RNase protection experiments. We identify sites of expression that correspond to mesenchymal cells of various parenchymal organs. Our finding implies a function of neuregulin as a mesenchymal factor that acts on epithelia. The mesenchymal expression of neuregulin could thus provide a molecular basis for the biological phenomenon of mesenchymal-epithelial interactions. It also has implications on the molecular mechanism by which amplification of c-neu can affect tumor progression of carcinomas. In addition, neuregulin expression is found in neuronal cells during development. We show by RNase protection experiments that distinct isoforms of neuregulin are expressed in the brain. Therefore, our data indicate in vivo a dual role for neuregulin as mesenchymal and neuronal factor.

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